Modeling of a fluidized-bed coal carbonizer

Goyal, A.; Rehmat, A.

doi:10.1021/ie00019a014

Cited by 13 publications

(7 citation statements)

References 10 publications

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“…Stripping voltammetry is a widely applied technique for the determination of Se(IV) because it is very sensitive and rapid (2)(3)(4)(5)(6)(7)(8)(9). Several authors have reported the use of carbon (10), gold (6,11), and mercury (12) for the development of such systems.…”

Section: Introductionmentioning

confidence: 99%

Determination of Selenium(IV) by Cathodic Stripping Voltammetry Using a Copper Microelectrode

SUz̆

Blagojević

Vidić

et al. 1997

Microchemical Journal

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Section: Introductionmentioning

confidence: 99%

Determination of Selenium(IV) by Cathodic Stripping Voltammetry Using a Copper Microelectrode

SUz̆

Blagojević

Vidić

et al. 1997

Microchemical Journal

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“…The properties of the selected feedstock, Montana lignite , and spruce wood, , are shown in Table . The fuel blend of coal and biomass is assumed to be dried to 2% (weight basis) moisture.…”

Section: Methodsmentioning

confidence: 99%

System Optimization for Fischer–Tropsch Liquid Fuels Production via Solar Hybridized Dual Fluidized Bed Gasification of Solid Fuels

et al. 2017

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A new configuration of solar hybridized dual fluidized bed (DFB) gasification process is proposed with char separation for the production of Fischer−Tropsch (FT) liquid fuels from solid fuels of biomass and/or coal. The addition of carbon capture with sequestration and FT reactor tail-gas recycle configurations is also assessed. The studied FT liquid fuels production systems are simulated by using a pseudodynamic model incorporating a year long, hourly averaged solar insolation time-series. For the case with a solar multiple (i.e., the heliostat field area relative to that required to meet the demand of the DFB gasifier at the point of peak solar thermal output) of 2.64 and bed material storage capacity of 16 h, the calculated annual solar share of the solar hybridized coal-to-liquids system can be increased from 12.2 to 20.3% by the addition of the char separation for a char gasification conversion of 80%. To achieve the well-to-wheel greenhouse gas emissions for FT liquid fuels parity with diesel derived from mineral crude oil, a calculated biomass fraction of 58% is required for the nonsolar coal case, also with a char gasification conversion of 80%. This fraction can be reduced to 30% by carbon capture and sequestration and further reduced to 17% by the integration of solar energy, based on a solar multiple of 2.64 and bed material storage capacity of 16 h. This reduction is significant given that biomass is much more expensive than coal. However, because of the higher content of light hydrocarbons content in the syngas produced with the studied biomass gasification, the specific FT liquids output per unit feedstock of the system decreases with an increase in the biomass fraction. As the biomass fraction is increased from 0 to 100%, this specific output is decreased from 59.6 to 48.3% but can be increased to 71.5 and 70.9%, respectively, by incorporating tail-gas recycle.

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“…For simplicity, the reactions of N and S are not considered here. The amount of pyrolysis products of coal and biomass followed the correlations used in the model of refs − . The correlations were separately derived from the experimental results of coal and woodchip pyrolysis.…”

Section: Experiments and Modelingmentioning

confidence: 99%

Numerical and Experimental Study on Oxy-fuel Coal and Biomass Co-firing in a Bubbling Fluidized Bed

Chen

Zhao

et al. 2019

Energy Fuels

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As one of the most promising approaches to reduce CO 2 emissions from power plants, oxy-fuel fluidized bed combustion technology still has a lot of basic uncertainties requiring in-depth studies, especially in application for coal and biomass co-firing. This work focuses on results of coal co-firing with biomass under O 2 /CO 2 combustion conditions in a 6 kW th bubbling fluidized bed combustor. With the same thermal input maintained, computational fluid dynamics (CFD) was adopted as a predictive tool to examine the effects of firing coal and co-firing biomass with coal under O 2 /CO 2 atmospheres. Hydrodynamics, heat transfer, species concentration, and char gasification in a fluidized bed were investigated. In comparison to coal combustion, the hydrodynamic and temperature profiles of biomass co-firing are not affected much when maintaining the same thermal input. The temperature of biomass co-firing at the bottom of the dense-phase zone, which is mainly the char combustion area, is about 10 K lower than that of coal combustion. Higher O 2 and H 2 O and lower CO 2 outlet concentrations were detected with biomass co-firing. Moreover, some typical parameters in biomass co-firing under oxy-combustion, including the cross-sectional average pressure, volumetric fraction distribution of the solid, velocity, and flue gas temperature, were analyzed in different atmospheres (21% O 2 /79% CO 2 , 30% O 2 /70% CO 2 , and 40% O 2 /60% CO 2 ). These results provide auxiliary insight into the complex influences on the biomass co-firing process by different atmospheres. Simultaneously, the experimental study of biomass co-firing under different atmospheres is used to validate the CFD modeling.

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Modeling of a fluidized-bed coal carbonizer

Cited by 13 publications

References 10 publications

Determination of Selenium(IV) by Cathodic Stripping Voltammetry Using a Copper Microelectrode

Determination of Selenium(IV) by Cathodic Stripping Voltammetry Using a Copper Microelectrode

System Optimization for Fischer–Tropsch Liquid Fuels Production via Solar Hybridized Dual Fluidized Bed Gasification of Solid Fuels

Numerical and Experimental Study on Oxy-fuel Coal and Biomass Co-firing in a Bubbling Fluidized Bed

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